So, just for the heck of it, I created a syntax highlighting module for english. (This is for vim, of course -- the only real editor.
It works well enough, but:
a) it takes almost 10 minutes to highlight a screen-full of english text on my 1 GHz linux box; and
b) the result appears -- at a casual peruse, anyway -- to be little more useful than if the words were highlighted with random colors!